When a vagina has lips that are large enough to stick togethercreating a singular shape that resembles a loaf of bread that must be sliced before being eaten.
"Damn, she has a nice lil muffin loaf on her and I'm about to get me a slice!"
"Some people like an innie and some people like an outie, I personally prefer a nice muffin loaf."
"This bathing suit is so small, I feel like my muffin loaf is showing."